OLED Pixel Circuit for 256-Grayscale Display
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Solution Overview
Problem
Existing pixel circuits for OLED displays are unable to achieve multi-grayscale display beyond 256 grayscales without significantly increasing costs.
Innovation Solution
A pixel circuit comprising a light emitting element, energy storage circuits, driving circuits, and control circuits that allow for the connection or disconnection of nodes and control terminals under specific voltage potentials, enabling efficient control of the light emitting element for various grayscale levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing pixel circuit designs are used, then the display can achieve basic grayscale display, but the number of displayable grayscales is limited and cannot reach 256 grayscales without significantly increasing cost
Solution Approach 1:
The pixel circuit is divided into multiple driving circuits (first driving circuit and second driving circuit) with different driving strengths. Each driving circuit can independently control the light emitting element, allowing the system to achieve multiple grayscale levels by selectively activating different driving circuits or combining their outputs, thereby reaching 256 grayscales without proportionally increasing overall circuit complexity
Solution Approach 2:
The circuit incorporates dynamic control mechanisms where the driving control circuit can dynamically switch between different driving circuits based on the required grayscale level. This dynamic selection allows the system to adapt the driving strength in real-time, enabling precise control over 256 grayscale levels while maintaining cost-effectiveness through shared circuit components
2Adaptability or versatility
If more driving circuits are added to increase grayscale levels, then the number of displayable grayscales increases, but the device complexity and manufacturing cost increase substantially
Solution Approach 1:
The driving control circuit serves multiple functions: it controls the first driving circuit, controls the second driving circuit, and can dynamically switch between them based on grayscale requirements. This multi-functional design allows the system to achieve 256 grayscales using a unified control structure rather than requiring separate dedicated circuits for each grayscale level, thereby reducing overall device complexity
Solution Approach 2:
The patent merges the control functions into a single driving control circuit that manages multiple driving circuits. Instead of having independent control circuits for each driving circuit, the design combines them into one unified controller that can selectively activate different driving circuits, reducing the total number of components while maintaining the capability for multi-grayscale display
Data Source
AI summary
A pixel circuit includes a light emitting element, a first energy storage circuit, a first driving circuit, a second driving circuit, a first driving control circuit, a second driving control circuit, a second energy storage circuit and a first control data voltage writing-in circuit; the first control data voltage writing-in circuit controls to write a first control data voltage into the third node under the control of a first writing-in control signal; both the first terminal of the first driving circuit and the first terminal of the second driving circuit are electrically connected to a power supply voltage terminal, the first driving circuit is used to drive the light emitting element under the control of a potential of the control terminal thereof, and the second driving circuit is used to drive the light emitting element under the control of a potential of the control terminal thereof.